Code No.67: Steering
Wheel Sensor Communication Line Error
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If there is any problem in
the CAN bus lines, an incorrect diagnosis code may be set. Diagnose the CAN bus lines before
the diagnosis codes (Refer to GROUP 54D, CAN bus-line diagnostic flow  ).
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The ASTC-ECU gathers information regarding the steering operation, through the CAN bus
line from the steering wheel sensor.
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DIAGNOSIS CODE SET CONDITIONS
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Diagnosis code No. 67 is set when all communication data are not sent from the steering
wheel sensor to ASTC-ECU.
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The most likely causes for these diagnosis codes to set are:
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- Damaged wiring harness or connector
- Malfunction of the steering wheel sensor
- Malfunction of the ASTC-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics
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Before connecting or disconnecting the M.U.T.-III, turn the ignition
switch to the "LOCK" (OFF) position.
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(1)Connect M.U.T.-III to the 16-pin diagnosis connector.
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(2)Turn the ignition switch to the "ON" position.
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(3)Diagnose the CAN bus line.
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(4)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is the check result normal?
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 Go to Step 3.
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 Repair the CAN bus line (Refer to GROUP 54D, CAN bus line Diagnostic flow ).
Then go to Step 2.
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STEP 2. Check whether the diagnosis code is reset.
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| caution |
Before connecting or disconnecting the M.U.T.-III, turn the ignition
switch to the "LOCK" (OFF) position.
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(1)Turn the ignition switch to the "ON" position.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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(4)Turn the ignition switch to the "ON" position.
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(5)Check if the diagnosis code is set.
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(6)Turn the ignition switch to the "LOCK" (OFF) position.
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Go to Step 3.
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The procedure is complete.
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STEP 3. Check the M.U.T.-III data list.
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(1)Turn the ignition switch to the "ON" position.
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(3)Check that the data list output changes within the following range when the steering
wheel is rotated.
OK: Approximately the same value as turning angle of steering wheel is displayed.
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Q.
Is the check result normal?
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Go to Step 9.
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Go to Step 4.
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STEP 4. Check D-308 steering wheel sensor connector, D-241 intermediate
connector, D-34 joint connector, D-403 junction block connector and D-405 junction block connector
for loose, corroded or damaged terminals, or terminals pushed back in the connector.
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Q.
Is the check result normal?
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Go to Step 5.
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Repair or replace the damaged component(s). Then go to Step 10.
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STEP 5. Check fuses No. 12 and 18.
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Check for short to earth in the wiring harness.
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Q.
Is the check result normal?
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Go to Step 6.
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Replace fuse No. 12 or 18. Then go to Step 10.
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STEP 6. Check the power supply circuit at D-308 steering wheel sensor
connector.
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(1)Disconnect D-308 steering wheel sensor connector, and measure at the harness side.
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(2)Turn the ignition switch to the "ON" position.
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(3)Measure voltage between terminal 1 and earth.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 7.
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Repair the wiring harness between the D-308 steering wheel sensor connector and
the ignition switch (IG2). Then go to Step 10.
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STEP 7. Check the fusible link No. 1.
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Check for short to earth in the wiring harness.
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Q.
Is the check result normal?
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Go to Step 8.
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Replace fusible link No.1. Then go to Step 10.
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STEP 8. Check the earth circuit at D-308 steering wheel sensor connector.
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(1)Disconnect D-308 steering wheel sensor connector, and measure at the harness side.
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(2)Measure the resistance between terminal 5 and earth.
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
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Replace the steering wheel sensor. Then go to Step 9.
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Repair the wiring harness between the D-308 steering wheel sensor connector and
earth. Then go to Step 10.
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STEP 9. Check whether the diagnosis code is reset.
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(1)Turn the ignition switch to the "ON" position.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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(4)Turn the ignition switch to the "ON" position.
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(5)Check if the diagnosis code is set.
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(6)Turn the ignition switch to the "LOCK" (OFF) position.
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Replace the ASTC-ECU. Then go to Step 10.
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It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How
to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent
Malfunction .
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STEP 10. Check whether the diagnosis code is reset.
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(1)Turn the ignition switch to the "ON" position.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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(4)Turn the ignition switch to the "ON" position.
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(5)Check if the diagnosis code is set.
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(6)Turn the ignition switch to the "LOCK" (OFF) position.
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Repeat the troubleshooting from Step 1.
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The procedure is complete.
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